Processing method of hot-rolled ribbed steel bar

Abstract

The invention relates to a processing method of a hot-rolled ribbed steel bar. The processing method comprises the steps of heating, rough rolling, intermediate rolling, finish rolling, intensive pressure water cooling, segmented shearing, cooling bed cooling, fixed-length shearing and the like, wherein in the finish rolling process, the depth of a transverse rib groove of a K1 rolling mill is reduced, and the sectional areas of roller holes of a K2 rolling mill, a K3 rolling mill and a K4 rolling mill are reduced. By designing the parameters of the roller holes of the rolling mills and the depths of the transverse rib grooves of the roller holes of the finished rolling mill, the filling degree of a rolled piece in the roller holes in the finish rolling process can be full, the size of a slitting belt can be effectively reduced, and then faults of an elbow punching opening are reduced; and the stability and the product quality of the hot-rolled ribbed steel bar in the production process are effectively improved.

Description

technical field [0001] The invention relates to the technical field of processing hot-rolled ribbed steel bars, more specifically, it relates to a processing method for hot-rolled ribbed steel bars. Background technique [0002] Hot-rolled ribbed steel bar, commonly known as rebar, is widely used in civil engineering construction such as houses, bridges, and roads. It is an indispensable structural material. With the vigorous development of civil engineering in recent years, the demand for rebar is increasing. [0003] At present, the special rolling factory mainly adopts the rolling method when producing hot-rolled ribbed steel bars. The specific process is to send the qualified continuous casting slabs into the walking beam heating furnace through the furnace roller table and heat them to the specified temperature. The final continuous casting slab is first rolled in the rough rolling unit for 6 passes for rough rolling. After the rough rolling is completed, the head (tail...

AI Technical Summary

Problems solved by technology

In the common finishing rolling mill, the rolling mill before the finished rolling mill, commonly known as the K2 rolling mill or the guide device at the exit of the 17# rolling mill, has a torsion angle. The rolled piece stands up after exiting the K2 rolling mill, and then bites into the roll hole of the K1 rolling mill. After the steel head bites into the K1 rolling mill, the temperature of the cut strip is high and the temperature on the other side is low, so the rolled piece tends to have a low temperature. The direction of bending occurs, resulting in the failure of the outlet of the elbow punch

[0007] The second is that in the existing finishing rolling mill, the depth of the transverse rib groove of the roll hole of the K1 rolling mill adopts the standard design of positive deviation, and the depth of the transverse rib groove of the roll hole of the K1 rolling mill is relatively deep. The size of the roll hole of the rolling mill is enlarged to increase the size of the incoming material of the K1 rolling mill, so as to ensure that the transverse rib grooves in the K1 rolling mill are filled. The larger size of the incoming material of the K1 rolling mill will cause the reduction of the K1 rolling mill to be too large, which will cause As a result, the extrusion force on both sides of the transverse rib groove on the rolled piece is too large during the rolling process. In addition, there is asymmetry between the upper and lower transverse rib grooves of the roll hole of the K1 rolling mill. After the rolled piece bites into the roll hole of the K1 rolling mill, it will Bending in the direction of the roll that fills the transverse rib groove first, which will also cause the failure of the elbow punching outlet

[0008] To sum up, in the existing production process of hot-rolled ribbed steel bars, due to the unreasonable temperature difference of the cutting strip and the unreasonable depth of the transverse rib groove, the failure of the elbow punching outlet is prone to occur, which seriously affects the production of hot-rolled ribbed steel bars. Production process stability and product quality

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